Figure 6
Plasma concentrations of thiols are significantly higher in birds in the Mechelse Heide (National Park Hoge Kempen, NPHK) (268.67 µmol/L ± 41.64; t = 3.07, p = 0.0093) when compared with those in Bosland (223.78 µmol/L ± 50.32), but not when compared with those in the military area of Meeuwen-Gruitrode (235.08 µmol/L ± 54; t = 1.92, p = 0.1417). Boxplots show thiol concentrations (µM) with median (thick black line), 25% and 75% quantiles (thin box), 90% range (whiskers) and outliers. P-values are based on post-hoc (ANOVA) Tukey-corrected pairwise t tests (Table 1, Model 9).
